vrc-get: Install shell completions

{ fetchCrate, lib, rustPlatform, pkg-config, stdenv, Security, SystemConfiguration }:

{ fetchCrate, installShellFiles, lib, rustPlatform, pkg-config, stdenv, Security, SystemConfiguration, buildPackages }:

rustPlatform.buildRustPackage rec {

  pname = "vrc-get";

    hash = "sha256-+xbHw1DpFmapjsFoUvxUqTok8TKMebMw3gYjO/rx/iU=";

  };

  nativeBuildInputs = [ pkg-config ];

  nativeBuildInputs = [ installShellFiles pkg-config ];

  buildInputs = lib.optionals stdenv.isDarwin [ Security SystemConfiguration ];

  cargoHash = "sha256-iuLhDcii+wXDNUsUMo8lj4kfJve5RAz7FT5Pxs9yFPQ=";

  # Execute the resulting binary to generate shell completions, using emulation if necessary when cross-compiling.

  # If no emulator is available, then give up on generating shell completions

  postInstall =

    let

      vrc-get = "${stdenv.hostPlatform.emulator buildPackages} $out/bin/vrc-get";

    in

    lib.optionalString (stdenv.hostPlatform.emulatorAvailable buildPackages) ''

      installShellCompletion --cmd vrc-get \

        --bash <(${vrc-get} completion bash) \

        --fish <(${vrc-get} completion fish) \

        --zsh <(${vrc-get} completion zsh)

    '';

  meta = with lib; {

    description = "Command line client of VRChat Package Manager, the main feature of VRChat Creator Companion (VCC)";

    homepage = "https://github.com/vrc-get/vrc-get";